Glass-drawing apparatus.



- W. L. CLAUSE.

. GLAS S DRAWING APPARATUS. APPLICATION FILED 'JAN.12, 1911.

1,123,684. Patented Jan; 5, 1915.

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EVZL'LEAI; L. CLAUSE, OF PETTSBUBGH, PENNSYLVANIA, ASSIGNQR '10 PITTSBURGH PLATE GLASS GDMPANY, A CORPORATION OF PENNSYLVANIA.

GLASS-DRAWING APPARATUS.

Application filed January 12, 1911.

of the United States, residing at in the county of Allegheny and 3t ennsylvania, have invented cerand useful improvements in Glassi g Apparatus, of which the following eification. reference to apparatus .ss cylinders, and particularly uism for supplying pressure to tor its primary objects; the on of improved glass drawing mechwhereby the pressure supplied to the ed imiform cylinder and thus ity of the drawn glass; and n of improved mechanism for -d regulating the pressure supther with such other objects as appear, or are incidental to .tion, 1 attain by means of a conillustrated in preferred form in nanying drawings, wherein is a representation of a glass 2 is a view of a modified form to Fig. l of the drawings, I ininatically indicated a glass fur- J13} which is being drawn a cylinder means of the bait 8. The bait 8 is prowith the usual blow pipe 10 and is g d supported on the frame. The ba' d by a hoisting or drawing cable 1 wound on a drum by the motor 2 1 gearing 13. The motor is cona controller is having four speeds i'fihrent steps in the drawing ep- A1, The mechanism for supplying the proper pressures to the bait and cylinder during the various stages of the drawing will now be described. T he blow pipe telescopes into a supply pipe which supply pipe divides into two branches 16 and 17, each of which is pro *ided with a fan 18 for generating" air-pressure. The branches 16 and 17 of the supply pipe are also provided with upwardly propctmg stems or tubes 19 and 20,

on which are mounted Water seal airometers 21 and 22. The airometers comprise a lower member or tank 23 provided with a double Specification of Letters Patent.

e ulated and made uniform to se-' t e in the drawing operation.

chanisin embodying my inven- Patented Jan. 5. 1915. Serial No. 802,215.

' wall andwith an upper inverted bucket or tankQal, as clearly shown in Fig. 1. But terfiy valves 25 and 26 are provided in the branches of the supply pipe between the airometers and the fans, and are operated by means of ropes 27 secured to the buckets 2a and running over pulleys 28. Atthe juncture of the supply pipe 15 and branches lfi and 17 is a two way valve 29 which is adapted to open and close communication between the branches and their respective airometers and the supply pipe.

The purpose of the airometers and butterfly valves is to secure a uniformity of continuous established or predetermined pressures, and their operation is as follows. The buckets 24 and 2e are of different weights, the former being heavier than the latter, so that a higher pressure will be required to lift the bucket 24 than the bucket 24. The pressures flowing from the branches 16 and 17 into the supply pipe 15 will consequently be different. In the present showing the bucket-s are weighted so that the pressures will be one ounce and two ounces respectively, and the Weighting can be readily changed to further vary the pressures to suit diflerent conditions. The higher pressure is used to form the neck portion of the cylinder and the lower pressure to form the cylinder proper. As shown in Fig. 1 the neck portion has been drawn, and the cylinder is being drawn on the low pressure. Now should the pressure in the airometer 2-2 become greater than one ounce the bucket 24: will rise and begin to close the butter-fly valve 26, thereby throttling the pressure from the fan 18 to the proper amount. When the pressure is again at one ounce the bucket will fall opening the butter-fly valve to allow a suflicient flow of pressure from the fan. I thus secure a uniform continuous pressure which results in an even or uniform cylinder of a uniform thickness of glass. It" the pressure be uneven the cylinder is alternately bulged and contracted and the thickness of the glass is consequently thinner and thicker in different portions. My invention overcomes this fault, and secures a better grade of glass.

The airometer 21 operates in the same manner, and when the valve 29 closes of? communication between either branch and the supply pipe the pressure remaining in the branch and airometer will raise the bucket and close the butter-fly valve as indicated in the left handof Fig. 1

In Fig. 2 I have shown a' modified form.

illustrated its use what I claim as new and desire to secure by Letters Patent is the following? I i 1 A glassdrawing apparatus comprising in'combination, a bait, drawing mecharfism for the bait, a pressure supply, a supply pipe for the bait dividing into two braiiches, a pressure regulator in each branch, throttling valves actuated by the regulators lo-' cated in the branches of the supply pipe be-' tween the regulators and the pressure supply, and a valve for controlling the admission of pressure from either branch of the supply pipe.

'2. A glass drawing mechanism comprising in combination, a bait, means-for elevating the bait, a supply pipe for the bait dividing into two branches, a pressure supply for each branch, a pressure regulator in each branch, throttling valves in the branches between the pressure supplies and the regulators, said valves being operated by the pressure regulators, and, a two way valve for controlling the admission of pres: sure from either branch into the supply pipe.

3. A glass drawing apparatus comprising in combination, a bait, elevating mechanism for the bait, a supply pipe dividing into two branches, a fan for each branch, a pressure regulator in each'branch, throttling valves in the branches between the fans and the pressure regulators, said valves being actuated by the regulators, and a two way valve' at the juncture of the supply pipe and its branches for controlling the admission of pressure from either branch into the supply pipe.

4. ing in combination, a bait, means for eleva ting the bait, a double pressure supply ior said bait, and means between each pressure 3 ing in combination a bait, means for elevat- 0 ing the bait to draw a cylinder, a plurality of pressure supplies for the bait, means automatically regulating the pressure of each pressure supply, and means for connecting any one of the pressure supplies to the bait while the bait is being elevated.

7. A glass drawing mechanism comprising in combination a bait, means for elevating the bait to draw a cylinder, a plurality of air supplies communicating with the bait, each having a diiferent uniform pressure, means automatically regulating the pressure of each air supply, and means for opening and closing the communication between the various air supplies and the bait.

8. A glass drawing mechanism comprising in combination a bait, means for elevating the bait to draw a cylinder, a pressure supply system for the bait, a plurality of connections between the pressure supply'and the bait, and means in each connection for antomatically regulating the pressure therein. In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

W. L. CLAUSE. \Vitnesses:

C. S. LAMB, Mo. SPAHR.

A glass drawing mechanism compris- 

